THE SURFACE OF VIRUSES 145 



red cells, may destroy the surface pattern responsible for adsorp- 

 tion in the first place. 



Probably the enzymatic part is also related to the antigenicity 

 of the virus, for there appear to be many surface antigens, of 

 the order of 1,000 small units and several hundred large units. 

 These units must have a great many common properties, al- 

 though they are not known to be identical. 



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